$C6/198: Number of Characters in Keyboard Buffer queue
Kernal-Reference:
CPX $C6 : $E5C0
DEC $C6 : $E5C4
LDA $C6 : $E5CD $F142
LDX $C6 : $EB35
LDY $C6 : $EB21
STA $C6 : $F6F7
STX $C6 : $E5F1 $EB40
STY $C6 : $E954
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